Apparatus for grinding and polishing precious stones.



. E. LOESSER.

APPARATUS FOR GRINDING AND POLISHING PRECIOUS STONES.

' APPLIUATIONIIL-ED JUNE 1, 1910. 1,094,913.

Patented M11228, 1914.

2 SHEE.TSSHEET 1.

Mai/51111701? fade/1% ATTORf/EY Patented Apr. 28, 1914.

2 SHEETS-SHEET 2.

v E. LOESSBR. APPARATUS FOR GRINDING AND POLISHING PRECIOUS STONES.

JXPPLIOATION FILED JUNE 1,1910.

WITNESSES:

ATTORNEY UNITED STATES T TEN OFFICE;

ERNEST LOESSEB, OFGLEN RIDGE, NEW JERSEY, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS,- TO NEW DIAMOND POLISHING TOOL COMPANY OF AMERICA, INC., OF NEW YORK, N. Y A CORPORATION OENEW YORK v arranarus son GRINDING AND POLISHING rnncious s'ro ss.

Specification of Letters Patent.

. Application n June 1, 1910. serial No. 564,5;47.

1 zation wherein a rotatable dop is mounted so that it maybe readily turned through known definite incrementsof rotation so that successive facets may be ground .or polished,

- when the axis of the dop is disposed at a or polis'hinglap. The dop may be adjusted by-.merzei-frotation about its axis for the giveniaiigle to the surfaceof the grinding grindin'g 'gor polishing of successive facets .of-thesameseries' Thus, having reference to the top-cf the stone, all of "the F eorner and; bezels facets may be successively groundafter which the'angle of the axis of the ;-dop may be changed so that the next seriesorff'star facets may be successively out, following which the angle of the axis may be'j-again changed to cut the successive facets known as haves. The table may be ground when the axis of the (hip is vertical. In like manner, the collets and facets below the. girdle may be ground.

. The dop holder may be so constructed as to have the capacity of angular adjustment.

'It is preferred, however, that the dop shall be rotatably mounted in'one holder for cutting one series of facets and that then-it be transferred to another holder dis osed at a different angle in which it may e rotated for cutting successively the facets of an- .other series, and so on. These holders of .ditierent angular relation to the plane of the face of the lap may be removably connected with the same apparatus. In. practice,"however, it is preferred that there shall be a series of apparatus onefor each angle at which the various series of facets are ground, and that the dop, when one series of facets has been'ground, shall be transferred to another apparatus. This Plan isv thought to have advantages over theme of a single paratus having the capacity for a "angular adjustment of the dop holder. .1;

In the-accompanyingdrawings Figure 1.

3, a vertical sectional view through the dop holderz'Fig. 4, a detail side elevation of the dop holder with its axis ata different angle 5, a detail from that shown in Fig. 3: Fi

Patented Apr. as, 191

plan view looking down upon the top of the justablehead so that the workman may with certainty adjust the frame 2 so tha t it shall be exactly horizontal when the grinding of afacethas been completed. The frame 2 is held -against lateral displacement in the usual way-by posts 5, 5 fixed in the bed I plate: The outer end of frame 2 is formed with a head 6 having a bore at right angles to the surface of the bcdl and, of course,

also to the grinding or polishi'n surface of the rotating lap 7. This bore is or'med with a key way to receive a key 8 on a sleeve fitting within the bore and having applied to it above and below the head nuts 9, 9, so that the position of the sleeve within the head may be adjusted-as desired. Within the sleeve, which has a tapered or flared opening top and bottom, is fitted -a spindle 10 having a. tapered shoulder 11 and to the upper end of the sleeve is appliedatapered washer-over which lies a nut 12 screwing on the end of the spindle. The spindle may therefore be held rigidly within the sleeve at the desired elevation or may be held fric tionally therein so as toresist the ordinary stress of the grinding or polishing operation and yet be'capable of being forcibly turned by hand. The lower end of the spindle 10 carries a head 13 disposed at an angle to the axis 'of the spindle and having in it a conical seat open at the top and bottom the axis of which is, as in Figs. 1 and 3, disposed at an angle of forty five degrees to the axis of the spindle. dop holder. Seated .in it so as to turn themin is a: correspondingly shaped dop 1% in the apex end of which is secured the stone 15 to be operated upon and atthe larger -end of is a side elevation: 2, aplan v ew: Fig. iwhich is a toothed wheel 16. In an gtf set This head will'be called the 17 of the head 13 is mounted to turn a bolt having an arm 18 projecting'at right angles and having a tapped aperture that maybe brought to a position concentric to the axis of the dop seat in'the holder. \Vhen the arm 18 isth'rown tobne side, the dop 14 my bedropped into the holder and then suitably held therein by the adjustable threaded bolt 19 working in. thev threaded aperture in the arm 18. Secured; to the holder 13 is a-leafspring 20-having a'tooth' at its {end that engages the teeth of the toothed orratchet wheel. 16.. V

With the. arts disposed as in Figs. ,1 and 3, the ra'pi y revolving lap will grind or 1 1 polish-a facet of the'stone and-when the-desired plane of the facet has been reached, the frame 2 will come in contact with post 4 and no fiarther abrasion of the facet can; occur, however long the dop may remain in the position in relation to the rapidly" rev )l\ nng""lap. To grind the next facet of'the same series an increment of rotation is given "tothedop within its holder, the screw 19 .may' beloosened, the spring 20 withdrawn -from the ratchet wheel and the dop turned through'any number of arcs equal to one or any desired number'of the teeth 16 when the 'spr'in is permitted to reengage the wheel and t e screw bolt 19 may again be tightened. Wh'nlall the facets of a given series have been ground, the dop holder, being in such case appropriately constructed thereto, may be adjusted to a different angle,for instance to the angle required for cutting of the next series of facets or the dop may be removed from the holder and transferred to that of another grinding apparatus in which the axis of the holder is at the desired angle. lVhen the top or bottom of the stone has been ground with the desired facets, the

stone may be re-set in another dop with the other side downward .and then in the same manner the facets for that side are ground.

ing is efiicient audit is, of course, character--.

ized by great simplicity. Nevertheless.

changes may be made by those skilled in the art without departing from the spirit of this invention. H

It will be seen from Fig. 3, that the stone in the dop is in line, or substantially so,

with the axis of the vertical spindle .10, which is rotatively adjustable.

This method of grinding is applicable not only to the brilliant cut, and also of course to the rose cut, but to the step out of square,

or'oblong stones.

I claim: 1. Precious stone grinding apparatus comwithin the socket.-

prising a dop holder having a conical socli'ct .opcn at both ends, the larger and of wh ch is uppermost to receive av correspondingly shaped dop having astone held in "the apex thereof and means fonhdldingthe dop 2. Precious stone-grinding apparatus com- .prising a ldop' holder having a conical socket open at both .cnds,'zt he la rger end of which is uppermostand whose axis is dlsposed at an angle-to the; plane inwhichthe surface of the grinding lap. runs, a correspondingly shaped dop seated and held in said socket and'mea'ns by which the dop may at .will be rotated through measured determined distances whereby facets of a series may be successi-vely cut. w

3. Apparatus for grinding precious stones comprising a dop holder having a conical dop seat-open at both ends, the larger end of which-'is-uppermost and with its axis disposed atan angle" to the, plane in .which the surface of the grinding lap runs,

a dop seatpdmherein and carrying at its apex and the stone to be operated upon and hav-- ing at its head a toothed wheel and means for. engaging the wheel to holdit successively-in adjustable positions whereby facets of a series maybe successively cut.

4. Prec1ous stone grinding apparatuscomprising1 a dop holder having a conical dop seat w ose axis is at an angle to the plane in which the surface of the lap'runs, a dop seated therein and carrying the stone to'be operated upon at-the apex end of the dop and in line with, its axis and means whereby the dop may, be turned about its axis through determined measuredarcs.

5. Preciousstone grinding apparatus'comprising a dop holder having a conical dop seat open at both ends, the layer end of which is uppermost, a swinging arm having a dop holding screw therein and a detent device adapted to engage a. dop seated in the seat to determine its adjustment therein.

6. Apparatus for grinding precious stones, comprising a vertical spindle, a dop holder carried thereby in a fixcd relation. thereto and having in it a dop-seat whose axis is at an angle to the axis of the spindle and which is adapted to receive a dop inserted through the top thereof, a-dop seated in'said seat with the 'end thereof in line with the axis of said spindle, or substantially so, and adapted to be progressively adjusted by rotation in said seat without removal therefrom, and means for locking the dop in adjusted positions, whereby all the facets of a series maybe progressively ground. a

7. Apparatus for grindin precious stones, comprising a vertical spin lo, a dop-holder carried thereby ina fixed relation thereto and having in it a dop-seat whose axis is at .an angle'to the axis of the spindle, a dop in line with the axis .of said spindle, or substantially s0, and adapted to.. bg rogressively adjusted by rotation in said seat With- 1 out removal therefrom, and means for locking the"d0p in adjusted positions, whereby all the facets of :1 series may be progressively ground.

- ERNEST LOES ERQ S. A. "STORY,

I J Witnesse s: M. DUTTON. 

